[16] In France the credit for the invention is given to Dr. Donné, who, about 1840, discovered that certain acids could be used to bite in the whites or the blacks of a daguerreotype. See also French chapter.
[17] This method, I believe, is no longer used.
[18] Adrian Marie and Emile Bayard died lately.
[19] See note p. 78.
[20] I did not mean I hoped it would die. It has now ceased to appear.
[21] S. Read was the first artist correspondent; he worked during the Crimean War.
[22] I do not mean to say that the American idea of having artists for art editors is unique. Everyone knows the good editorial work that has been done, and is still being done by Mr. Bale, Mr. W. L. Thomas, Mr. Thomson, Mr. Mason Jackson, Mr. L. Raven-Hill, to mention no others.